Fastify's Content-Type header tab character allows body validation bypass

Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-25223 · CVE overview and exploitation status

EUVD-2026-5157

GHSA-jx2c-rxcm-jvmq

cve-program · CVE-2026-25223

• https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq
• https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821
• https://hackerone.com/reports/3464114
• https://fastify.dev/docs/latest/Reference/Validation-and-Serialization
• https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125
• https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272

euvd · EUVD-2026-5157

• https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq
• https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821
• https://hackerone.com/reports/3464114
• https://fastify.dev/docs/latest/Reference/Validation-and-Serialization
• https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125
• https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272

nvd · CVE-2026-25223

• https://fastify.dev/docs/latest/Reference/Validation-and-Serialization
• https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125
• https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272
• https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821
• https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq
• https://hackerone.com/reports/3464114
• https://access.redhat.com/errata/RHSA-2026:10184
• https://access.redhat.com/errata/RHSA-2026:5807
• https://access.redhat.com/errata/RHSA-2026:6192
• https://access.redhat.com/security/cve/CVE-2026-25223
• https://bugzilla.redhat.com/show_bug.cgi?id=2436560
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25223.json

osv · GHSA-jx2c-rxcm-jvmq

• https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq
• https://nvd.nist.gov/vuln/detail/CVE-2026-25223
• https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821
• https://hackerone.com/reports/3464114
• https://fastify.dev/docs/latest/Reference/Validation-and-Serialization
• https://github.com/fastify/fastify
• https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125
• https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272

No related changes are available here.